Basis of Presentation and Significant Accounting Policies Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Details) $ in Thousands |
Dec. 31, 2017
USD ($)
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|---|---|
| Basis of Presentation and Significant Accounting Policies [Abstract] | |
| Cumulative effect of adoption of new accounting principle | $ (9,918) |
| X | ||||||||||
- Definition Basis of Presentation and Significant Accounting Policies [Abstract] No definition available.
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| X | ||||||||||
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. No definition available.
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